I use Yahoo's toolbar for IE right now for the main reason that I can have my bookmarks at all my machines. But sometimes I like to use Mozilla's Phoenix browser and the Yahoo toolbar does not work for that browser (I like the tabbed browsing, speed, and stability of Phoenix). So I found this cool tool that syncs my bookmarks to a server and all my machines can have the bookmarks and it's available on IE and Mozilla (and Macintosh and Palm!). Try it out at SyncIt.com.